Much less than one month. More like one day, or even a few hours depending on your job.

Or to paraphrase an answer to the original question- because Windows is so cheap (compared to the other costs in a business) that it's simply not worth any effort at all to avoid it.

Saving $100 on the lifetime cost of a laptop, and the person who uses it, is a rounding error from 0.

Whereas every incompatibility, mitigation, driver download, print failure etc just costs time.